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For questions about the chemical concepts of electrolysis.
2
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Alumina solubility in cryolite (Hall-Heroult process)
Most of the bath is cryolite ($\ce{Na3AlF6}$) and not alumina ($\ce{Al2O3}$) because for electrolytic reduction, we do not use an aqueous solution, we have to use melt alumina. But alumina melts at a …